NF ISO 6338, M51-014 (08/2023)

This document provides a method for calculating GHG emissions from an LNG liquefaction plant, whether onshore or offshore. The scope of this document extends from the LNG plant inlet facilities to the unloading arms for the loading a truck, boat or wagon. Gas supply upstream to the inlet flange of inlet facilities and LNG distribution downstream of loading arms are only covered generally. This document covers: — all installations associated with the production of LNG, this includes reception installations, condensate unit (if applicable), pre-treatment units (including, among others, acid gas removal , dehydration, mercury removal, heavy hydrocarbon removal), LPG extraction and fractionation (if applicable), liquefaction, LNG storage and loading, boil-off gas management , flaring and waste treatment systems, imported electricity or on-site electricity generation, and other plant utilities and infrastructure (e.g., shipping and transportation facilities). — natural gas liquefaction facilities associated with the production of other products (such as domestic gas, condensate, LPG, sulfur, export of electricity) in order to be able to allocate GHG emissions to the different products . — GHG emissions associated with LNG production. These emissions are divided into category 1, category 2 and category 3 of the responsible organization. Categories 1, 2 and 3 are defined in this document. All emission sources are covered, including flaring, combustion, cold vents, process vents, fugitive leaks, and emissions associated with imported energy. The LNG plant is considered to be “in operation”, this includes emissions associated with commissioning, initial start-up, maintenance, overhaul and restarts after maintenance or disruption. The construction, commissioning, extension and abandonment phases are excluded, but can be assessed separately. Emissions resulting from the management of boil-off gases during loading of a ship or any export vehicle are covered. Emissions from a ship at berth, for example outgassing through the mast, are not covered in this document. This document describes the allocation of GHG emissions to LNG and other hydrocarbon products when other products are produced (e.g. LPG, domestic gas, condensates, sulfur, etc.). This document defines the preferred units of measurement and the necessary conversions. This document also recommends instrumentation and estimation methods to monitor and report GHG emissions. Some emissions are measured and others estimated. This document is applicable to the LNG industry. Applications include providing a method to calculate GHG emissions through a standardized and auditable method, a way to determine their carbon footprint.
(Automatic translation from French)